Seriously, what are Bitcoin and other popular cryptocurrencies used for?

Is this just speculation, or is it mainly a way for small time dealers to raise cash quickly? Because from my perspective, it hasn't done jack in the real world, in material terms, does it just make it easier to launder money? I know cryptocurrency is considered a store of value, somewhat similar to the fixed income products offered by major banks. But it only exists because the internet exists. Bitcoin only exists because there's an internet connection, nothing more. Is it ultimately just specu

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